20-21高二·全国·课后作业
1 . 在等差数列
中:
(1)已知
,求首项
与公差d;
(2)已知
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c69c89f9a4bf3d75e129dbb0b6880c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024af739e2a9b1c16ebbb8afc6c79817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5bbae9353140c2235610852d04a9a3f.png)
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2021-11-04更新
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3卷引用:西藏林芝市第二高级中学2021-2022学年高二上学期期末数学(文)试题